Dynamic analysis of the effect of nose length on train aerodynamic performance

被引:83
作者
Chen, Guang [1 ,2 ,3 ]
Li, Xiao-Bai [1 ,2 ,3 ]
Liu, Zhen [1 ,2 ,3 ]
Zhou, Dan [1 ,2 ,3 ]
Wang, Zhe [1 ,2 ,3 ]
Liang, Xi-Feng [1 ,2 ,3 ]
Krajnovic, Sinisa [4 ]
机构
[1] Cent S Univ, Minist Educ, Key Lab Traff Safety Track, Changsha 410000, Hunan, Peoples R China
[2] Joint Int Res Lab Key Technol Rail Traff Safety, Changsha 410000, Hunan, Peoples R China
[3] Natl & Local Joint Engn Res Ctr Safety Technol Ra, Changsha 410000, Hunan, Peoples R China
[4] Chalmers Univ Technol, Dept Mech & Maritime Sci, S-41296 Gothenburg, Sweden
基金
美国国家科学基金会;
关键词
IDDES; Nose length; Aerodynamic force; Slipstream; Wake flow; WAKE; SLIPSTREAM; FLOW; DES;
D O I
10.1016/j.jweia.2018.11.021
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The improved delayed detached eddy simulation (IDDES) was used to study the influence of the train's nose length on its aerodynamic performance. Both the time-averaged and instantaneous near-wake structures and the associated distribution of slipstream velocity are compared for three nose lengths. As the nose length increases, the mean and Std values of the drag and lift force are decreased. The shorter nose-length case results in a higher slipstream velocity. In particular, at the TSI track-side position, the TSI value U-2 delta for the 5-m nose length case is 30% and 32% higher than the corresponding values for the 7.5-m and 10-m nose length cases, respectively. The dynamical flow topology in the wake reveals that the flow structures of the 5-m nose length are different from those of the other two cases in the tail streamline surface. As nose length increases, the longitudinal vortices are weaker, and the angle and distance between the longitudinal vortices are smaller. The shear production from the P-xy caused by the separation of the boundary layer at the lateral wall of the tail train is greater than that of the P(xz )caused by the separation of the boundary layer at the top and bottom of the tail train.
引用
收藏
页码:198 / 208
页数:11
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